From 51c0f1a3df57602cf7c3658e0428e33e7fedfb73 Mon Sep 17 00:00:00 2001
From: Sune Broendum Woeller <sune@woeller.dk>
Date: Mon, 27 Oct 2014 23:20:39 +0100
Subject: [PATCH] fix AttributeError: 'NoneType' object has no attribute
 'getroottree' when the result is not html / is empty.

---
 src/plone/app/theming/transform.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/plone/app/theming/transform.py b/src/plone/app/theming/transform.py
index 9e214df0..05ff8fac 100644
--- a/src/plone/app/theming/transform.py
+++ b/src/plone/app/theming/transform.py
@@ -91,7 +91,7 @@ def parseTree(self, result):
 
         try:
             return getHTMLSerializer(result, pretty_print=False)
-        except (TypeError, etree.ParseError):
+        except (AttributeError, TypeError, etree.ParseError):
             return None
 
     def transformString(self, result, encoding):